Boiler



J. F. L. BAKER.

BOILER.

APPLICATION FILED APR. 3, 1918.

- v ATTORNEY UNITED STATES PATENT @FFICE.

JOHN F. L. BAKER, o1 sAeIN w, MICHIGAN, ASSIGNOR TO 'THE WICKES BOILER COMPANY, or SAGINAW, MICHIGAN, A CORPORATION or MICHIGAN.

BOILER.

Specification of Letters Patent.

Patented Feb. 28, 1922.

Application filed April 3, 1918. Serial No. 226,420.

To all whom it my concern:

Be it known that JOHN F. L. B KER, a citizen of the United States, residing at Saginaw, in the county of Saginaw and State of Michigan, has invented certain new and useful Improvements in Boilers; and he does hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to water tube boilers and the improvement pertalns more particularly to a novel construction of the water leg and steam legs of water tube boilers whereby the objects of my invention are attained.

These objects are, first, to provide a water leg so formed as to doaway with lapped and riveted joints in locations where the said joints would be exposed to the products of combustion, if the brick work of the furnace falls away, as frequently occurs, exposing the lower part of the front and back water legs; second, to have only one seam in the water leg and that located-outside the front and casing so as to be at all times visible for leakage and accessible for calking or repairs.

A further object is to simplify the construction of the water leg of a water tube boiler, while increasing its strength and permitting its one riveted joint to be hydraulically riveted.

A still further object is to form the tube sheet so as to adapt it for use with strai ht tubes even though the upper rows of tu es be not parallel with the lower rows.

With the foregoing and certam other objects in view which will appear later 1n the specification, my invention comprises the devices described and claimed herein, and the equivalents thereof.

In the-drawings, Fig. 1 1s a part vertical section through the front water leg and the front furnace wall of a water tube boiler, embodying my improvement.

Fig. 2 is a similar section of the rear header.

As is clearly shown in the drawln device consists in a tube sheet of w 10h 1 designates the flat or tube-recelvlng art of the sheet, and 2 the outwardly flange edges of the sheet.

s, the

These edges are flanged to a relatively large radius, as shown at 3, in order to preserve the strength of the tube sheet and to enable it to properly withstand the pressures to which it is subjected in use.

The reinforcing effect of the enlarged radius is obvious when it is noted that if the tube-sheet were flanged to a small radius, thereby exposing the side and edge wall of the water leg as a'substantially flat surface, that surface must of necessity be braced by a system of internal stays connecting the flat edge wall and the tube sheet, or else connecting the two opposite edge walls, in order to properly stifl'en these walls.

The enlarged radius of applicants improved construction, by reason of its shape, increases the strength of the edge walls of the water leg and makes it unnecessary to use any internal stays, thereby reducing the number of rivet holes required in the surfaces, reducing the labor, and weight of the material and simplifying the construction of the water leg.

The flanges are deep, that is to say, they are of suflicient depth to form the top, bottom and two sides of a water and steam leg of suflicient capacity to permit the proper functioning of the boiler.

Inserted between the flanges 2 of the tube sheet, is a flanged head 4:, the flanges of which, indicated at 5,- are received within the flanges of the tube sheet 1, that is to say, the flanged head 4 is backed into the flanges of the tube sheet. The flanges 2 and 5 are riveted or otherwise secured to gether, and thus there is formed between the tube sheet 1 and the head 4, a water space 6.

In some cases, where the upper rows of tubes are arranged at an angle with respect to the lower rows of tubes, I form the upper part of tube sheet 1 as shown in Figs. 1 and 2, where 8 is an offset formed by striking up the metal of tube sheet 1 to provide aflat surface to receive the upper tubes. I also thereby enlarge the space between the tube sheet and head 4 and form a steam liberating chamber 7 By this arrangement, I am also enabled to use straight upper tubes instead of being obliged to bend them as heretofore.

By the means above described, I am enabled to produce a tube sheet of great strength and stiffness, having flanges that not only serve to connect the tube sheet to the outer head, but also forming the tops, sides and bottoms of the front and back headers, thereby avoiding the use of riveted sea-ms on the fire side of the tube sheets and eliminating the difliculties heretoforeencountered because of the burning out of lapped riveted seams when brought into contact with the fire by the falling away of parts of the furnace brick work.

The construction described permits the use of one less joint than in previous constructions, and by means of the offset 8,

the boiler construction is further simplified, enabling straight tubes to be used throughout.

Having thus described my invention, what E.- C. FISHER, FRANK H. PAYNE.

to secure by Letters 

